| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/tower-0.4.13/src/util/either.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>either.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../tower/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../tower/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Contains [`Either`] and related types and functions. |
| //! |
| //! See [`Either`] documentation for more details. |
| |
| </span><span class="kw">use </span>futures_core::ready; |
| <span class="kw">use </span>pin_project::pin_project; |
| <span class="kw">use </span>std::{ |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll}, |
| }; |
| <span class="kw">use </span>tower_layer::Layer; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="doccomment">/// Combine two different service types into a single type. |
| /// |
| /// Both services must be of the same request, response, and error types. |
| /// [`Either`] is useful for handling conditional branching in service middleware |
| /// to different inner service types. |
| </span><span class="attribute">#[pin_project(project = EitherProj)] |
| #[derive(Clone, Debug)] |
| </span><span class="kw">pub enum </span>Either<A, B> { |
| <span class="doccomment">/// One type of backing [`Service`]. |
| </span>A(<span class="attribute">#[pin] </span>A), |
| <span class="doccomment">/// The other type of backing [`Service`]. |
| </span>B(<span class="attribute">#[pin] </span>B), |
| } |
| |
| <span class="kw">impl</span><A, B, Request> Service<Request> <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: Service<Request>, |
| A::Error: Into<<span class="kw">crate</span>::BoxError>, |
| B: Service<Request, Response = A::Response>, |
| B::Error: Into<<span class="kw">crate</span>::BoxError>, |
| { |
| <span class="kw">type </span>Response = A::Response; |
| <span class="kw">type </span>Error = <span class="kw">crate</span>::BoxError; |
| <span class="kw">type </span>Future = Either<A::Future, B::Future>; |
| |
| <span class="kw">fn </span>poll_ready(<span class="kw-2">&mut </span><span class="self">self</span>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), <span class="self">Self</span>::Error>> { |
| <span class="kw">use </span><span class="self">self</span>::Either::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="self">self </span>{ |
| A(service) => Poll::Ready(<span class="prelude-val">Ok</span>(<span class="macro">ready!</span>(service.poll_ready(cx)).map_err(Into::into)<span class="question-mark">?</span>)), |
| B(service) => Poll::Ready(<span class="prelude-val">Ok</span>(<span class="macro">ready!</span>(service.poll_ready(cx)).map_err(Into::into)<span class="question-mark">?</span>)), |
| } |
| } |
| |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, request: Request) -> <span class="self">Self</span>::Future { |
| <span class="kw">use </span><span class="self">self</span>::Either::<span class="kw-2">*</span>; |
| |
| <span class="kw">match </span><span class="self">self </span>{ |
| A(service) => A(service.call(request)), |
| B(service) => B(service.call(request)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><A, B, T, AE, BE> Future <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: Future<Output = <span class="prelude-ty">Result</span><T, AE>>, |
| AE: Into<<span class="kw">crate</span>::BoxError>, |
| B: Future<Output = <span class="prelude-ty">Result</span><T, BE>>, |
| BE: Into<<span class="kw">crate</span>::BoxError>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><T, <span class="kw">crate</span>::BoxError>; |
| |
| <span class="kw">fn </span>poll(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="self">Self</span>::Output> { |
| <span class="kw">match </span><span class="self">self</span>.project() { |
| EitherProj::A(fut) => Poll::Ready(<span class="prelude-val">Ok</span>(<span class="macro">ready!</span>(fut.poll(cx)).map_err(Into::into)<span class="question-mark">?</span>)), |
| EitherProj::B(fut) => Poll::Ready(<span class="prelude-val">Ok</span>(<span class="macro">ready!</span>(fut.poll(cx)).map_err(Into::into)<span class="question-mark">?</span>)), |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S, A, B> Layer<S> <span class="kw">for </span>Either<A, B> |
| <span class="kw">where |
| </span>A: Layer<S>, |
| B: Layer<S>, |
| { |
| <span class="kw">type </span>Service = Either<A::Service, B::Service>; |
| |
| <span class="kw">fn </span>layer(<span class="kw-2">&</span><span class="self">self</span>, inner: S) -> <span class="self">Self</span>::Service { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Either::A(layer) => Either::A(layer.layer(inner)), |
| Either::B(layer) => Either::B(layer.layer(inner)), |
| } |
| } |
| } |
| </code></pre></div> |
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